Hello Entropy,
Welcome to the forum. This is a nice looking watch indeed. I can tell you as someone that began trying out watchmaking with pin-levers that they are simple, but not easy to put back together because they simply lack the level of finish of better made movements. Now, that said, I love pin-levers and have worked on several types from the big makers at the time: Ebauche Bettlach (EB), Baumgartner, (BFG) and Brac, but I have not worked on an English pin lever. They are unusual and, honestly, some of them keep time almost as well as my vintage Omegas--that is my reference point for quality. If you have good tools and magnification, then do what some of the other members have suggested. Take a picture at every step and follow them backwards to reassemble. I will suggest you keep a close eye not just on the drive wheels, but also on the length of screws as they may look similar to one another. I once put back a watch and one of the screws was slighty longer than the other two and it was rubbing against the barrel. It finally discovered it after tearing the watch apart again and noticing the very slight differece between three screws that held the calendar wheel in place. Another suggesstion I will make is to be very careful with the hairspring/balance. If you mess that up you will have a watch that will not run, or it will run very fast--this has happened to me three times. I've never had a watch run slow! The problem is that even though you may be able to find a replacement complete balance, it will be difficult to replace on the old balance cock/regulator because of the stud used to secure instead of a screw as in higher quality movements. I have ruined brand new hairsprings because the stud requires steady pressure to stay put AND it has to be at a right angle to the axis of rotation AND the hairspring MUST be poised or the impulse finger will not drive the pallet properly, and the watch will not run. This is an area where I have not seen any videos demonstrating how to do this. In any case, give it a shot....if at any point it seems too daunting, stop and put the watch away for another time. I am also sure the wonderful members of the forum will provide help and guidance if you ask...myself included. Good luck!
JC